Tested and working. The battery in it will be included but its remaining life is unknown. Includes a printed copy of the user manual in English. Skywatch Xplorer is the perfect companion for enthusiasts of all kinds of wind sports such as paragliding, dinghy sailing and the different disciplines of surfing as it allows to know the wind conditions before starting the activity and the apparent wind while performing it. It is so small and light that can be worn hanging all the time while catching waves or performing maneuvers in the air. Displayed data Current wind speed Maximum wind speed Average wind speed Current temperature Perceived temperature Features Backlight Replaceable CR2032 lithium battery (battery life: several years of regular use) Automatically switches off after 1 minute or possibility of being constantly on Dimensions : 41 x 93 x 17 mm Weight: 50 g Wind measurement Units of measurement km/h, m/s, fps, mph, knots, Bft Resolution 0.1 up to 99.9, then to the unit Precision 3% Range of measurement 3km/h to 150km/h Temperature measurement Units of measurement C and F Resolution 0.1 Measurement cycle one measurement every 0.5 seconds Precision 0.3 to 20 C / 0.5 from -20 to +50C Range of measurement from -50 C to +100 C?